Paper, 'On the minute structure of the muscle-columns or sarco-styles which form the wing-muscles of insects. Preliminary note' by Edward Albert Sharpey-Schafer Sharpey-Schafer writes: 'The fibres of the wing-muscles of most insects are made up of readily separable longitudinal elements, which are often called the “wing-fibrils,” although several observers have remarked the existence of an apparently fine fibrillation in them.' Annotations in pencil and ink. Subject: Entomology / Anatomy Received 15 December 1890. Read 8 January 1891. A version of this paper was published in volume 49 of the Proceedings of the Royal Society as 'On the minute structure of the muscle-columns or sarco-styles which form the wing-muscles of insects. Preliminary Note'. 1890